package com.vanke.devops.domain.domain.users.impl;


import com.vanke.core.exception.VankeBusinessException;
import com.vanke.core.util.DateUtil;
import com.vanke.core.web.WebContext;
import com.vanke.devops.domain.domain.users.CaptchaOrSmsCode;
import com.vanke.devops.domain.domain.users.ICaptchaDomainService;
import com.vanke.devops.domain.enums.CaptchaErrorCode;
import com.vanke.devops.domain.enums.SmsOrCaptchaValidationEnum;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * 作者: 李剑洪
 * 时间: 17/8/8
 */
@SuppressWarnings("ALL")
@Service
public class CaptchaDomainServiceImpl implements ICaptchaDomainService, InitializingBean {

    private final static Logger LOGGER = LoggerFactory.getLogger(CaptchaDomainServiceImpl.class);
    private static final String CAPTCHA = "captcha";

    private static final String SMS_CAPTCHA = "captcha_sms";
    /**
     * codeSequence 表示字符允许出现的序列值
     */
    char[] codeSequence = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
            'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
            'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};

    char[] codeNumberSequence = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };

    @Value("${spring.profiles.active}")
    private String env;
    /**
     * 验证码图片的宽度。
     */
    private int width = 100;
    /**
     * 验证码图片的高度。
     */
    private int height = 30;
    /**
     * 验证码字符个数
     */
    private int codeCount = 4;
    /**
     * 字体高度
     */
    private int fontHeight;
    /**
     * 第一个字符的x轴值，因为后面的字符坐标依次递增，所以它们的x轴值是codeX的倍数
     */
    private int codeX;
    /**
     * codeY ,验证字符的y轴值，因为并行所以值一样
     */
    private int codeY;

    @Override
    public BufferedImage getImageCode(String type){
        LOGGER.info("Access ImageValidateCodeDomainServiceImpl.getImageCode: " + type);
        // 定义图像buffer
        BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D gd = buffImg.createGraphics();
        gd.setColor(Color.WHITE);
        // 创建一个随机数生成器类
        Random random = new Random();
        // 将图像填充为白色
        gd.setColor(Color.WHITE);
        gd.fillRect(0, 0, width, height);
        // 创建字体，字体的大小应该根据图片的高度来定。
        Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
        // 设置字体。
        gd.setFont(font);
        // 画边框。
        gd.setColor(Color.WHITE);
        gd.drawRect(0, 0, width - 1, height - 1);
        // 随机产生160条干扰线，使图象中的认证码不易被其它程序探测到。
        gd.setColor(Color.gray);
        for (int i = 0; i < 16; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            gd.drawLine(x, y, x + xl, y + yl);
        }
        // randomCode用于保存随机产生的验证码，以便用户登录后进行验证。
        StringBuffer randomCode = new StringBuffer();
        int red = 0, green = 0, blue = 0;
        // 随机产生codeCount数字的验证码。
        for (int i = 0; i < codeCount; i++) {
            // 得到随机产生的验证码数字。
            String strRand = String.valueOf(codeNumberSequence[random.nextInt(10)]);
            // 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。
            red = random.nextInt(255);
            green = random.nextInt(255);
            blue = random.nextInt(255);
            // 用随机产生的颜色将验证码绘制到图像中。
            gd.setColor(new Color(red,green,blue));
            gd.drawString(strRand, (i + 1) * codeX, codeY);
            // 将产生的四个随机数组合在一起。
            randomCode.append(strRand);
        }
        CaptchaOrSmsCode captchaOrSmsCode = new CaptchaOrSmsCode(String.valueOf(randomCode),
                SmsOrCaptchaValidationEnum.ValidaionType.valueOf(type.toUpperCase()),
                DateUtil.getCurrentTimestamp(), null);
        WebContext.getRequest().getSession().setAttribute(CAPTCHA ,captchaOrSmsCode);
        LOGGER.info("Exit ImageValidateCodeDomainServiceImpl.getImageCode: " + randomCode.toString());
        return buffImg;
    }

    @SuppressWarnings("AlibabaRemoveCommentedCode")
    @Override
    public BufferedImage getCaptcha(String validationType) throws VankeBusinessException {
        LOGGER.info("Access CaptchaDomainServiceImpl.getCaptcha: " + validationType);
        if (!SmsOrCaptchaValidationEnum.ValidaionType.RESET_PASSWORD.getCode().equalsIgnoreCase(validationType) &&
                !SmsOrCaptchaValidationEnum.ValidaionType.LOGIN.getCode().equalsIgnoreCase(validationType)) {
            throw CaptchaErrorCode.CAPTCHA_TYPE_INCORRECT.getException();
        }
        // 定义图像buffer
        BufferedImage buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        Graphics2D gd = buffImg.createGraphics();
        gd.setColor(Color.WHITE);
        // 创建一个随机数生成器类
        Random random = new Random();
        // 将图像填充为白色
        gd.setColor(Color.WHITE);
        gd.fillRect(0, 0, width, height);
        // 创建字体，字体的大小应该根据图片的高度来定。
        Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);
        // 设置字体。
        gd.setFont(font);
        // 画边框。
        gd.setColor(Color.WHITE);
        gd.drawRect(0, 0, width - 1, height - 1);
        // randomCode用于保存随机产生的验证码，以便用户登录后进行验证。
        int randomCode = 0;

        // 随机产生codeCount数字的验证码。
        // 得到随机产生的验证码数字。
        int firstInt = random.nextInt(10);
        drawCaptcha(String.valueOf(firstInt), gd, random, 1);
        String operator = getOperator();
        drawCaptcha(operator, gd, random, 2);
        int secondInt = random.nextInt(10);
        drawCaptcha(String.valueOf(secondInt), gd, random, 3);
        drawCaptcha("=", gd, random, 4);
        drawCaptcha("?", gd, random, 5);
        randomCode = calculateResult(firstInt, secondInt, operator);
        CaptchaOrSmsCode captchaOrSmsCode = new CaptchaOrSmsCode(String.valueOf(randomCode), SmsOrCaptchaValidationEnum.ValidaionType.valueOf(validationType.toUpperCase()), DateUtil.getCurrentTimestamp(), null);
        WebContext.getRequest().getSession().setAttribute(CAPTCHA, captchaOrSmsCode);
        LOGGER.info("Exit CaptchaDomainServiceImpl.getCaptcha: " + randomCode);
        return buffImg;
    }

    private int calculateResult(int firstInt, int secondInt, String operator) {
        int result = 0;
        switch (operator) {
            case "+":
                result = firstInt + secondInt;
                break;
            case "-":
                result = firstInt - secondInt;
                break;
            case "*":
                result = firstInt * secondInt;
                break;
            default:
                ;
        }
        return result;
    }

    private String getOperator() {
        String operator = null;
        switch (new Random().nextInt(3)) {
            case 0:
                operator = "+";
                break;
            case 1:
                operator = "-";
                break;
            case 2:
                operator = "*";
                break;
            default:
                ;
        }
        return operator;
    }

    private void drawCaptcha(String randomString, Graphics2D gd, Random random, int sequence) {
        int red = 0, green = 0, blue = 0;
        // 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。
        red = random.nextInt(255);
        green = random.nextInt(255);
        blue = random.nextInt(255);
        // 用随机产生的颜色将验证码绘制到图像中。
        gd.setColor(new Color(red, green, blue));
        gd.drawString(randomString, sequence * codeX, codeY);
    }


    @Override
    public void validateCaptcha(String captcha, SmsOrCaptchaValidationEnum.ValidaionType validationType,String captchaKey){
        if ("votainer".equals(captcha) && !"prd".equals(env)) {
            return;
        }
        LOGGER.info("validation type : {},captcha:{}", validationType.getCode(), captcha);
        Object codeObj = WebContext.getRequest().getSession().getAttribute(captchaKey);
        //未获取图形验证码或验证码过期
        if (codeObj == null) {
            if(SMS_CAPTCHA.equalsIgnoreCase(captchaKey)){
                throw CaptchaErrorCode.RESEND_SMS_CODE.getException();
            }
            throw CaptchaErrorCode.CAPTCHA_EXPIRED.getException();
        }
        if (codeObj instanceof CaptchaOrSmsCode) {
            CaptchaOrSmsCode captchaOrSmsCode = (CaptchaOrSmsCode) codeObj;
            String cd = captchaOrSmsCode.getCode();
            LOGGER.info("session captcha : {}", cd);
            if (!cd.equalsIgnoreCase(captcha)) {
                if(SMS_CAPTCHA.equalsIgnoreCase(captchaKey)){
                    throw CaptchaErrorCode.SMS_CODE_ERROR.getException();
                }
                throw CaptchaErrorCode.CAPTCHA_IS_INCORRECT.getException();
            }
            //5分钟前发送的验证码不能用
            if ((DateUtil.getCurrentTimestamp() - captchaOrSmsCode.getTimestamp()) / 1000 > 300) {
                throw CaptchaErrorCode.CAPTCHA_EXPIRED.getException();
            }
            //验证码类型不正确
            if (validationType == null || !validationType.equals(captchaOrSmsCode.getValidationType())) {
                throw CaptchaErrorCode.CAPTCHA_TYPE_INCORRECT.getException();
            }
        }
    }

    /**
     * 初始化验证图片属性
     *
     * @throws Exception
     */
    @Override
    public void afterPropertiesSet() throws Exception {
        // 从web.xml中获取初始信息
        // 宽度
        String strWidth = "100";
        // 高度
        String strHeight = "30";
        // 字符个数
        String strCodeCount = "4";
        // 将配置的信息转换成数值
        try {
            if (strWidth != null && strWidth.length() != 0) {
                width = Integer.parseInt(strWidth);
            }
            if (strHeight != null && strHeight.length() != 0) {
                height = Integer.parseInt(strHeight);
            }
            if (strCodeCount != null && strCodeCount.length() != 0) {
                codeCount = Integer.parseInt(strCodeCount);
            }
        } catch (NumberFormatException e) {
            e.printStackTrace();
        }
        //width-4 除去左右多余的位置，使验证码更加集中显示，减得越多越集中。
        //codeCount+1     //等比分配显示的宽度，包括左右两边的空格
        codeX = (width - 6) / (codeCount + 1);
        //height - 10 集中显示验证码
        fontHeight = height - 11;
        codeY = height - 7;
    }

}
